* Adds BigSolo source extension
* Improves BigSolo extension
Improves the BigSolo extension by introducing DTOs for data handling.
Enhances error handling and streamlines the parsing of data from JSON responses.
* Refactors BigSolo extension
Migrates BigSolo extension from ParsedHttpSource to HttpSource.
Utilizes keiyoushi.utils.parseAs for JSON parsing.
Implements in-memory caching for series data to reduce redundant calls.
Passes the search query as URL fragment.
* Simplifies DTO and uses non-null assertions
